 In 1966, Gentry trained Darby Dan Farm's Graustark, winner of the 1965 Arch Ward Memorial Stakes at Arlington Park and the 1966 Bahamas Stakes at Hialeah Park.After Buckpasser suffered a quarter crack, Graustark became widely favored to win the Kentucky Derby that year.Because Graustark had never raced over 7 furlongs, it was decided, in spite of a slightly infected left front hoof, to run him in the 9 furlong Blue Grass Stakes as a prep for the 1966 Kentucky Derby.